Apparatus for opening air-tight tins



F. F. COAKER.

APPARATUS ron OPENING AIR TIGHT TINS.

APPLICATION FILED JULY T. 1920.

Patented May 3, 1921.

FREDERICK F. GOAKER, OF SHAFTESBURY, ENGLAND.

APPARATUS FOR OPENING AIR-TIGHT TINS.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed July 7, 1920. Serial No. 394,599.

To all whom it may concern:

Be it known that I, FREDERICK FRANK Column, a subject of the King of Great Britain and Ireland, residing at 25 High street, Shaftesbury, in the county of Dorset, England, have invented a new and useful Improvement in Apparatus for Opening Air-Tight Tins, of which the following is a. specification.

My invention relates to an improved construction of airtight sealed tins provided with a slip-on lid having attached to it two cutters adapted to come into operation and cut through the airtight lid when it is desired to open the tin; the slip-on lid provided with a hinge remaining as the lid of the tin when the same has been opened.

I have illustrated my invention in the accompanying drawing in which- Figure 1. shows a plan view of the airtight sealed top of a rectangular tin according to my invention. V

*ig. 2. shows a view of the entire construction in isometric perspective.

Fig. 3. is a section of a portion of the tin, showing the hinged slip-on lid in place on the airtight closed tin.

Fig. 4 is a section showing the cutter in position. while the airtight closure is intact.

Fig. 5. cutter pressed sealed lid.

Fig. 6. shows the cutter in operative position and the hinged side piece of the slipon cover raised.

My apparatus consists of a square slip-on cover 1, with three fixed sides or flanges 2, the fourth side 3 being hinged. Attached to this cover are two cutters 4 each having a sloping cutting edge and a vertical back. The cutters are arranged so that they remain wedged between the sides of the cover and the sides of the tin until required for the purpose of opening the tin 6, when the cover is removed from the tin and each cutter is slid slightly inward, into such a position as is a section showing the piercing into position through the to drop just within the sides of the tin. The cover is then replaced on the tin, and forced down, the two cutters puncturing the sealed top of the tin. The cover is then slid across the tin away from its hinged side the two cutters meantime making two incisions the whole width of the tin. The cover is then again removed and replaced so as to travel in a direction at right angles to the direction previously traveled and the same operation repeated, resulting in two further incisions throughout the whole width of the tin. The result is that the airtight lid 5 of the tin 6 is completely out around and can be removed. The slip-on cover can then be replaced and used as an ordinary cover to the tin. For the purpose of holding the hinged portion of the cover in position when used merely as a cover, the hinged portion is provided with a small flap 7 at each end which comes into contact with the adjacent side of the cover and is held in position by a slight protuberance 8 corresponding with a slight hollow in the side of the tin.

What I claim is 1. In combination, a rectangular airtight closed tin, a slip-on cover fitting on the top of said tin, a hinged side piece on said cover and a pair of cutters on said cover capable of being pressed downward to pierce through the airtight lid of the tin and slit the same when the slip-on cover is drawn across the lid.

2. In the apparatus claimed in claim 1, the feature that the cutters are located between the outside of the tin and the hinged flange of the slip-on cover until the said cover is replaced in the cutting position upon the tin lid.

3. In the apparatus claimed in claims 1 and 2, a recurved attachment 7 at each end of the hinged cover-flange.

In testimony whereof I have signed my name to this specification.

F. F. COAKER. 

